A comparative study of preprocessing methods in the parametric loudspeaker

Shi, Chuang; Kajikawa, Yoshinobu

doi:10.1109/apsipa.2014.7041678

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…They are the upper and lower SSB methods, which depends on the sign of (1), both the SRT and SSB methods are expected to eliminate the harmonic distortion of the PAL when the Berktay's far-field solution is valid and the ultrasonic emitter is perfect [7]. The modulated audio inputs of the DSB, SRT, and SSB methods are shown in Fig.…”

Section: Parametric Array Loudspeakermentioning

confidence: 99%

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Identification of the parametric array loudspeaker with a volterra filter using the sparse NLMS algorithm

Shi

Kajikawa

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Volterra filters can be applied to a wide range of nonlinear systems, keeping only the low order kernels to yield a good approximation. The parametric array loudspeaker (PAL), as a weak nonlinear acoustic system, is an attractive directional sound reproduction device. Volterra filters have been adopted in the linearization system of the PAL that efficiently reduces the nonlinear distortion with no need of solving the nonlinear acoustic equation. In this paper, the ultrasound-to-ultrasound Volterra filter is proposed, being inspired by the nonlinear acoustic principle, to provide a better systematic representa tion of the PAL. Experiment results are presented to prove the effectiveness of the proposed approach, where the sparse NLMS algorithm is carried out in the identification.

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Section: Parametric Array Loudspeakermentioning

confidence: 99%

“…For this reason, there have been many preprocessing methods to suppress the nonlinear distortion of the PAL [4][5][6][7]. The audio bandwidth extension has been attempted to improve the perceptual sound quality of the PAL [8,9].…”

Section: Introductionmentioning

confidence: 99%

Identification of the parametric array loudspeaker with a volterra filter using the sparse NLMS algorithm

Shi

Kajikawa

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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“…Audible reproductions from PLs are known to require a large carrier SPL (>110 dB) for typical speech conversation levels of ≈ 60 dBA, which has potential inadvertent health risks [2]. Fortunately, for applications of speech soundfields, high SPLs from the PL are not necessary for high frequency ( 2 kHz) components of speech [19], further, harmonic distortions are lower above this frequency [16]. Taking into account the PL location so that the far-field demodulated audio [27] overlays D b and under the assumption that high SPL from the PL is not required over D b , health risks from the PLs could be argued to be negligible.…”

Section: B Pls For Speech Soundfieldsmentioning

confidence: 99%

“…Reproduction of speech soundfields [11], [17], [18] would require low carrier SPL in PLs due to the low energy of high frequency components in speech [19], thus reducing related health risks. Further, frequency dependent PL distortions are less of a problem at higher frequencies [16].…”

Section: Introductionmentioning

confidence: 99%

“…Practical implementations have shown PLs can provide immersive spatial audio [14], [15], however, neither of the hybrid approaches use MSR with dynamic loudspeakers or consider spatial aliasing. When comparing PLs to MSR from dynamic loudspeakers, PLs lack directivity at low frequencies [12], contain higher Total Harmonic Distortion (THD) [2], [16] and can have potential health risks due to the high Sound Pressure Level (SPL) of the ultrasonic carrier frequency [2].…”

Section: Introductionmentioning

confidence: 99%

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Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Donley

Ritz

Kleijn

2016

2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

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This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a non-hybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker. Abstract-This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a nonhybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker.

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Demodulated sound quality improvement for harmonic sounds in over-boosted parametric array loudspeaker

2022

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A comparative study of preprocessing methods in the parametric loudspeaker

Cited by 10 publications

References 16 publications

Identification of the parametric array loudspeaker with a volterra filter using the sparse NLMS algorithm

Identification of the parametric array loudspeaker with a volterra filter using the sparse NLMS algorithm

Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Demodulated sound quality improvement for harmonic sounds in over-boosted parametric array loudspeaker

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